title: Three-dimensional evaluation of effectiveness of hand and rotary instrumentation for retreatment of canals filled with different materials.
abstract: The aim of this study was to measure the remaining filling volume of different obturation materials from root-filled extracted teeth by using 2 removal techniques. Eighty single-rooted teeth were collected and decoronated, and the root canal was prepared by using the ProTaper nickel-titanium rotary files. The teeth were randomly allocated into 4 groups, and each group was obturated by using a different material. Group 1 was filled with gutta-percha and TubliSeal sealer, group 2 was filled with EndoRez points and EndoRez sealer, group 3 was filled with RealSeal points and RealSeal sealer, and Group 4 was filled with a gutta-percha point and GuttaFlow sealer. Teeth were scanned with a micro-computed tomography scan, and then root fillings were removed by using ProTaper retreatment files or hand K-files. Teeth were scanned again, and volume measurements were carried out with micro-computed tomography software. Statistical analysis showed significant differences between the 2 removal techniques for gutta-percha and for both techniques between gutta-percha and the other groups. The present study showed that all tested filling materials were not completely removed during retreatment by using hand or rotary files. Gutta-percha was more efficiently removed by using hand K-files.
authors.affiliation: School of Dentistry, University of Manchester, Manchester, United Kingdom. Electronic address: Mohammad.Hammad@postgrad.manchester.ac.uk.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Hammad
authors.affiliation: School of Dentistry, University of Manchester, Manchester, United Kingdom.
authors.forename: Alison
authors.initials: A
authors.lastname: Qualtrough
authors.affiliation: School of Dentistry, University of Manchester, Manchester, United Kingdom.
authors.forename: Nick
authors.initials: N
authors.lastname: Silikas
mesh_terms: D003762:Dental Instruments; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D019233:Retreatment; D012387:Root Canal Filling Materials; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods*; D055114:X-Ray Microtomography
chemical_list: D012387:Root Canal Filling Materials